You may receive error message
80070641 when install Office/Outlook update, windows updates failure
..., this page contains some useful information to repair your
computer error code 0x80070641, if you fixed this error from this
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The definition of the error code you’ve received 80070641 can be
found below:

ERROR_INSTALL_SERVICE_FAILURE - The Windows Installer Service
could not be accessed. This can occur if the Windows Installer
is not correctly installed.

If you can successfully install applications that rely on the
Windows Installer then the service itself is most likely
functional, and was simply in use at the time of the update.
Thus, you will want to make sure that the Windows Installer
service is not in use prior to attempting updates.

If the issue persists after you’ve confirmed no installations
are taking place proceed with the troubleshooting below.

How to stop the Windows Installer service.

If you are sure no installations or configurations, which rely
on the Windows Installer, prior to updating you can try
manually stopping the Windows Installer service, and then
attempting Windows Update. If the error code persists after that
the issue may be related to a corrupt or otherwise damaged
Windows Installer.